To investigate the history of plate subduction—when one of Earth’s tectonic plates slides beneath another—Sarah M. Aarons and colleagues compared ancient rocks from the Acasta Gneiss Complex in Canada to modern rocks. Using isotope analysis, the researchers found that Acasta rocks dating to about 4.02 billion years ago (bya) most strongly resemble modern rocks formed in a plume setting (an area in which hot rocks from Earth’s mantle flow upward into the crust). By contrast, they found that Acasta rocks dating to about 3.75 bya and 3.6 bya have an isotope composition that is similar to that of modern rocks formed in a subduction setting. Aarons’s team therefore concluded that ______ Which choice most logically completes the text? Choose 1 answer: Choose 1 answer: (Choice A, Checked) the majority of the rocks in the Acasta Gneiss Complex formed through subduction. A the majority of the rocks in the Acasta Gneiss Complex formed through subduction. (Choice B) subduction-like processes began occurring in some locations no later than 3.75 bya. B subduction-like processes began occurring in some locations no later than 3.75 bya. (Choice C) the rocks in the Acasta Gneiss Complex are of a more recent origin than scientists previously thought. C the rocks in the Acasta Gneiss Complex are of a more recent origin than scientists previously thought. (Choice D) subduction replaced mantle plume formation as the most common geological process by about 4.02 bya. D subduction replaced mantle plume formation as the most common geological process by about 4.02 bya.

Question

To investigate the history of plate subduction—when one of Earth’s tectonic plates slides beneath another—Sarah M. Aarons and colleagues compared ancient rocks from the Acasta Gneiss Complex in Canada to modern rocks. Using isotope analysis, the researchers found that Acasta rocks dating to about 4.02 billion years ago (bya) most strongly resemble modern rocks formed in a plume setting (an area in which hot rocks from Earth’s mantle flow upward into the crust). By contrast, they found that Acasta rocks dating to about 3.75 bya and 3.6 bya have an isotope composition that is similar to that of modern rocks formed in a subduction setting. Aarons’s team therefore concluded that ______ Which choice most logically completes the text? Choose 1 answer: Choose 1 answer: (Choice A, Checked)   the majority of the rocks in the Acasta Gneiss Complex formed through subduction.  A the majority of the rocks in the Acasta Gneiss Complex formed through subduction. (Choice B)   subduction-like processes began occurring in some locations no later than 3.75 bya.  B subduction-like processes began occurring in some locations no later than 3.75 bya. (Choice C)   the rocks in the Acasta Gneiss Complex are of a more recent origin than scientists previously thought.  C the rocks in the Acasta Gneiss Complex are of a more recent origin than scientists previously thought. (Choice D)   subduction replaced mantle plume formation as the most common geological process by about 4.02 bya. D subduction replaced mantle plume formation as the most common geological process by about 4.02 bya.

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Analyze Findings:  Analyze the findings: Aarons and colleagues found that rocks from 4.02 bya resemble modern plume setting rocks, while rocks from 3.75 bya and 3.6 bya resemble those from a subduction setting. Relate Findings:  Relate findings to choices: Since the older rocks (4.02 bya) are like plume setting rocks and the younger rocks (3.75 bya and 3.6 bya) are like subduction setting rocks, it suggests a transition in geological processes over time. Evaluate Choices:  Evaluate choices:  - Choice A suggests all major rocks formed through subduction, which contradicts the findings for 4.02 bya rocks. - Choice B states that subduction-like processes began by 3.75 bya, aligning with the findings. - Choice C and D are not supported by the data provided.

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